Hi,
I provide a relation between /package name/ and /latest version/ on
Hackage as both JSON and JSONP.

   http://www.typeful.net/~tbot/hackage/

This are static files, and they are regenerated whenever new packages
are uploaded (with a delay of about one minute).

Two simple usage examples are given in the README[1].

Feel free to access this information for whatever purpose!

Cheers,
Simon

[1] https://github.com/sol/hackage-jsonp#readme

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